Answer:
Integrity.
Explanation:
In this scenario, Martin Shkreli, former CEO of pharmaceutical company Retrophin, has many traits of a leader. He is very intelligent, brash, extroverted, and driven to succeed. But he lacks the key trait to keep the confidence of others, which eventually led to a fraud conviction. Hence, he lacks integrity.
Integrity can be defined as an attribute which involves being honest, sincere, upright, adherence to strong moral and ethical principles or morally based values.
In this context, Martin Shkreli was eventually convicted for fraud because he lacked the quality of being trustworthy, truthful, honest and keeping the confidence of others.
